diff --git a/.github/workflows/reusable_test_suite.yml b/.github/workflows/reusable_test_suite.yml
index 7c0d470..8792ca9 100644
--- a/.github/workflows/reusable_test_suite.yml
+++ b/.github/workflows/reusable_test_suite.yml
@@ -45,7 +45,7 @@ jobs:
           git submodule init
           git submodule update
           pip uninstall ${REPO_NAME} -y || true
-          pip install -e .[dev]
+          pip install --no-build-isolation .[dev]
 
       - run: make lint
 
diff --git a/docker/Dockerfile.firedrake-parmmg b/docker/Dockerfile.firedrake-parmmg
index 0210779..8e116a8 100644
--- a/docker/Dockerfile.firedrake-parmmg
+++ b/docker/Dockerfile.firedrake-parmmg
@@ -7,6 +7,9 @@ ARG BRANCH="main"
 
 WORKDIR /root
 
+# Ensure /github/home/.cache/pip is editable by the user
+RUN mkdir -p /github/home/.cache/pip && chmod -R 777 /github/home/.cache/pip
+
 # Install Thetis
 RUN pip install --verbose --src . -e git+https://github.com/thetisproject/thetis.git#egg=thetis
 
diff --git a/docker/Dockerfile.firedrake-parmmg_release b/docker/Dockerfile.firedrake-parmmg_release
index c5d91f6..d7fe827 100644
--- a/docker/Dockerfile.firedrake-parmmg_release
+++ b/docker/Dockerfile.firedrake-parmmg_release
@@ -7,6 +7,9 @@ ARG BRANCH="main"
 
 WORKDIR /root
 
+# Ensure /github/home/.cache/pip is editable by the user
+RUN mkdir -p /github/home/.cache/pip && chmod -R 777 /github/home/.cache/pip
+
 # Install Thetis
 RUN pip install --verbose --src . -e git+https://github.com/thetisproject/thetis.git#egg=thetis
 
diff --git a/docker/Makefile b/docker/Makefile
index 6c5d022..05f194f 100644
--- a/docker/Makefile
+++ b/docker/Makefile
@@ -4,7 +4,7 @@ PACKAGE		?=
 OPTIONS		?=
 NAMESPACE	= ghcr.io/mesh-adaptation
 IMAGE		= $(PACKAGE)
-TAG			= latest
+TAG			?=
 USERNAME	?=
 TOKEN		?=